v3.26.1
Cover Page - shares
 3 Months Ended
Mar. 31, 2026
Apr. 30, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 001-41137  
Entity Registrant Name CONSTELLATION ENERGY CORPORATION  
Entity Tax Identification Number 87-1210716  
Entity Incorporation, State or Country Code PA  
Entity Address, Address Line One 1310 Point Street  
Entity Address, City or Town Baltimore  
Entity Address, State or Province MD  
Entity Address, Postal Zip Code 21231-3380  
City Area Code (833)  
Local Phone Number 883-0162  
Title of 12(b) Security Common Stock, without par value  
Trading Symbol CEG  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock Shares Outstanding   361,190,063
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001868275  
Amendment Flag false  
Constellation Energy Generation, LLC    
Document Information [Line Items]    
Entity File Number 333-85496  
Entity Registrant Name CONSTELLATION ENERGY GENERATION, LLC  
Entity Tax Identification Number 23-3064219  
Entity Incorporation, State or Country Code PA  
Entity Address, Address Line One 200 Energy Way  
Entity Address, City or Town Kennett Square  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 19348-2473  
City Area Code (833)  
Local Phone Number 883-0162  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Central Index Key 0001168165